Major upgrades! Any ideas on hp gains?

I think if it has a stock camshaft, not much unfortunately. You removed exh restriction, and added some port volume (both of which I dont consider bad...) but you didnt change the control for all the airflow. The cam. If it has some soert of small cam, I dont think you'll feel that "night and day" difference Unless it's mostly emotional. Last two items, swap that intake, and swap ina cam. And you'll be having that night and day feeling.